Elastic Aerogels of Cellulose Nanofibers@Metal–Organic Frameworks for Thermal Insulation and Fire Retardancy

更新时间:2023-05-28

【摘要】Metal-organic frameworks（MOFs） with high microporosity and relatively high thermal stability are potential thermal insulation and flame-retardant materials.However,the difficulties in processing and shaping MOFs have largely hampered their applications in these areas.This study outlines the fabrication of hybrid CNP@MOF aerogels by a stepwise assembly approach involving the coating and cross-linking of cellulose nanofibers（CNPs） with continuous nanolayers of MOFs.The cross-linking gives the aerogels high mechanical strength but superelasticity(80% maximum recoverable strain,high specific compression modutus of～200 MPa cm3 g-1,and specific stress of～100 MPa cm3 g-1).The resultant lightweight aerogels have a cellular network structure and hierarchical porosity,which render the aerogels with relatively low thermal conductivity of～40 mW m-1 K-1.The hydrophobic,thermally stable MOF nanolayers wrapped around the CNPs result in good moisture resistance and fire retardancy.This study demonstrates that MOFs can be used as efficient thermal insulation and flame-retardant materials.It presents a pathway for the design of thermally insulating,superelastic fire-retardant nanocomposites based on MOFs and nanocellulose.

【关键词】

阅读全文